ratios and K slopes99P. Staszel -Jagiellonian University, KrakówIV Polish Workshop on RHIC, Kraków 2007BRAHMSqqhadronsleadingparticleleading particleSchematic view of jet productionParticles with high pt’s (above ~2GeV/c)are primarily produced in hard scatteringprocesses early in the collisionExperimentally →depletion of the high ptregion in hadron spectraIn A-A, partons traverse the medium→Probe of the dense and hot stagep+p experiments →hard scatteredpartons fragment into jets of hadronsIf QGP→partons will lose a largepart of their energy(induced gluon radiation)→suppression of jet production↔Jet QuenchingHigh ptsuppression &